Improvement in mortise door-latches



Mortise Door-Latches. I

N0,147,560, Patented Feb.17.1874" III/III/IIIIIIIIIIIIIIIIIII? '1'UNITED STATES PATENT OFFICE.

ALBERT l). JUDD, OF NEW HAVEN, CONNECTICUT.

IMPROVEMENT IN MORTISE DOOR-LATCHES.

Specification forming part of Letters Patent No. 147,560, dated Felrualy 17, 11574; application filed January 2, 1874.

To all whom it may concern 7 Be it known that I, ALBERT l). J UDl), of

New Haven, in the State of Connecticut, have invented an Improvement inMortise-Latches for Store-Doors, &e., of wh ch the following is aspecification:

Latches have been made with a sliding block operating upon a leverwithin the ease, as seen in Letters Patent No. 138,680.

My invention is made for lessening the frietion of the parts andpreventing the sliding block becoming wedged in the ease. I make use ofa link-bar extending upwardly from the sliding block to a belleranklever located above the stem of the sliding latch, and acting upon thesame by means of a fork and a notch in the stem..

In the drawing, Figure 1 is an elevation of i the latch with the ease insection, and Fig. 2 is a sectional plan at theline w .r.

The case is made of the front plate a, box I), and cap-plate c, andwithin the said case is the latch d, that passes through the front platea, and is provided with the stein c and spring J", said stein slidingthroughthe guide-lugs It, and being notched for the forked end t of thebellcrank lever I, that swings upon the fulcrumstud r. The link-barnextends upwardly from the latch-block 1', and is vjointed, at s, to oneend of the lever l. The block 1- is guided at its edges in the notch oropening made atu in thee-use b c, and upon theinner surfaces of the casethe ribs 2 3 are provided, so that the parts can be finished ofi' trueand parallel to allow the block to slide freely, the stud 0 serving tohold the linkbar nin position on one side, and the projection 4,extending toward the edge of the ease in the other direction, to steadythe block 7*. t

It is to be understood that the thumb-lever of the latch, on one or bothsides of the door, extends across below the block 1', so as to press thesame upwardly when the thumb-lever is acted upon.

By this construction the link-bar, extending upwardly to the joint 8,serves to guide the block 4' and hold it inposition by the aid of thestud e and projection 41. t

I claim as my invention-- 'lhe link-bar at, extending upwardly from theblock it, and hinged to the bell-crank lever Z at a point above the stemof the latch, in combination with the latch d, stem 0, spring f, stud v,and projection 4 bearing against the box (if-the ease, as and for thepurposes set forth.

Signed by me this 23d day of December, A.

A. D. JUDD.

\Vitnesses:

(3-120. '1. PINCKNEY, (nus. H. SMITH.

